15
CDX-L250/L430X
TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
Procedure :
1. Set to the test mode.
2. Push the SRC button and set to FM.
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button
: FM
FREQUENCY SELECT switch (L430X) : FM 50k
3. Adjust with the volume RV2 on TU601 so that the “FM”
indication turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
*1: L430X are indicates “98.00”.
Adjustment Location : See page 16.
0 dB = 1 µV
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM Auto Scan/Stop Level Adjustment
Carrier frequency : 97.9 MHz (L250)
: 98.0 MHz (L430X)
Output level
: 22 dB (12.6 µV)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM Auto Scan/Stop Level check can be
performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Turn ON the regulated power supply to ACC and BATT
terminals is “OFF” position (display 1:00).
2. Push the preset 4 button.
3. Push the preset 5 button.
4. Press the preset 1 button for more than two seconds.
5. Then the display and LED on the front panel indicates all lights,
the test mode is set.
<Release the Test Mode>
1. Push the OFF button.
SECTION 3
ELECTRICAL ADJUSTMENTS
antenna
terminal
FM RF signal
generator
0.01
µ
F
set
FM
97.90
Z
ST
SHUF
1
l
Display
FM0
Z
97.90
Z
ST
SHUF
1
l
Display
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